So my parents have a trailer that they rent out. The tenant, who has Huntington’s Disease, had three large, impossible-to-control dogs that had the run of the place. They, naturally, trashed it. The problem is that his female dog whelped a litter of seven puppies who also had the run of the house. The puppies became ill with what we think, after consulting vets, was parvovirus. They suffered from bloody diarrhea. Now the tenant is gone, and we have to clean up the trailer. It’s, without exaggeration, coated in dog feces and urine, filled with clothes soaked in same, and alive with flies. The tenant tore up the carpeting, and in many cases there is exposed fibreboard. One of the puppies died in the trailer.
Enough background information, here’s the question: can the place be properly cleaned? What kind of protection do the people doing the cleaning need? How in God’s name do you clean up after ten sick dogs in a small trailer home? I don’t even know what to call this to search on it.
Oh dear god. I hope you aren’t being recruited to help with the cleanup.
You will almost certainly have to replace the flooring/tile/carpet down to, and maybe including, the sub floor, and you may have to replace any porous surfaces that would absorb smells (any fabric, couch cushions, exposed fiberboard, etc…) The rest of the interior will have to be completely disinfected. If you can’t bleach it, you will probably end up replacing it.
Until you have all contaminated materials off the site and burned, you will probably need full biohazard suits (not sealed, just for splashes) and biological air filtration (paint masks aren’t enough). After that, the workers should be able to go about with the normal level of protection.
No insurance on the place? I know some guys in Austin who are handy with a match. 
I suggest using gasoline, or some other, highly flammable substance.
There are services who do this kind of cleaning.
If the trailer is insured, try your insurance co. It sounds destroyed and reimbursable as is, without the activation of any gasoline.
Pick up some tornado insurance, and then sit back and wait.
Well, one traditional method is to divert two rivers to do your work. Helps if you’re Hercules, though.
The only thing I have heard of that effectively kills parvo is bleach. And whatever the dogs touched has to be soaked in it. Parvo is highly contagious, and not just to young dogs, and it can live in the environment for a long time.
A good general cleaner I like is Orange Apeel, don’t know if you have it in the States? Not one of those ripoffs that you can buy in Wal-Mart, but actual Orange Apeel works very well, and smells great (if you like oranges, which I do).